@misc{cryptoeprint:2006:483,
    author = {Alfredo De Santis and Anna Lisa Ferrara and Barbara Masucci},
    title = {New Constructions for Provably-Secure Time-Bound Hierarchical Key Assignment Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2006/483},
    year = {2006},
    url = {http://eprint.iacr.org/2006/483},
}